Piano-action, mechanical player.



I PATENTBD APR. 24, 1906. P. KRUMSGH-EID.

PIANO AOTIO N,MBGHANI-GAL PLAYER. APPLICATION FILED JULY 29, 1905.

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed July 29, 1905. Serial No. 271,830.

To all whom it may concern.-

Be it known that I, PETER KRUMsoHEm, a citizen of the United States, anda resident of Boston, in the county of Suffolk and State ofMassachusetts, have invented a new and useful Improvement inPiano-Actions, Mechanical Players, of which the following, taken inconnection with the accompanying drawings, is a specification.

My invention relates to a mechanism connected to a fixed part of thepiano and so arranged that the upward movement of the staff, which isoperated by the mechanical player, will serve to throw up a lever andthrough it the extension-piece and the wippen and also cause a reactionby the said lever on the end of the key, and thus keep it in place.

The object is to simplify the construction of these parts and to securemore perfect results. This object I attain by means of the constructionshown in the accompanying drawings, in which Figure 1 is an elevationshowing my device and the parts of a piano-action that relate to mydevice. Fig. 2 shows in plan the parts in which my invention isinvolved.

In the drawings, A represents a piano-key of ordinary construction. Thiskey is mounted and has the ordinary adjuncts of piano"- keys, and itneed not be particularly described.

My device is attached to the rail R by the bracket H and consists of aswinging link E, pivoted to the bracket H by the pin E and pivotallyconnected to the tilting foot-piece D D by the pin The tiltingfoot-piece D D has one end D resting upon the capstanscrew A while itsother end D rests upon the pad O at the upper end of the staff B. Thelower end of the extension-piece K rests in a recess P, formed in thetilting foot-piece D D, and has flanges K K attached to it. Theseflanges extend downward, so as to em.-

brace the sides of the tilting foot-piece D D ,and are pivotallyattached to the said tilting foot-piece and also to the link orextensionguide E by the pin E The end of the tilting foot-piece D D isprovided with an opening, as indicated by dotted lines at T, to admit ofthe insertion of a screw-driver for the purpose of turning theadjusting-screw A.

The operation of my device is as follows: Keeping in mind the fact thatthe tilting foot-pieceD Dis free to be moved from either end and to actupon the extension-piece K and through it the wippen and hammerthus, ifthe key A is depressed the capstanscrew A will cause the end D of thefoot-piece to rise, and thus raise the extension-piece K, the end Dturning on the end C of the staff B as a fulcrum. In case the mechanicalplayer is operating then the stall B will raise the end D of the tiltingfoot-piece and cause the extension K to rise, and thus operate thecapstan-screw A as a fulcrum and incidentally hold the key A in place.

I claim- In a pianoforte-action, having a mechanical player attachment,a device consisting of a key and adjusting capstan-screw anextension-piece resting upon a tilting erated by it and said tiltingfoot, the outer end of which rests upon the said adjustingscrew; amechanically-operated riser constructed to actuate the said tiltingfoot; and an extension-guide one end of which is pivoted to a fixed partand the free end to the said tilting foot-piece; substantially as andfor the purpose set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, 011 this 25th dayof June, A. D.1905.

PETER KRUMSCHEID. l/Vitnesses:

EDWARD GRAMER, WILLIAM EnsoN.

foot and op-

